This release of the C420 is a low-nose "phase 2" model. All Phase 2 versions will feature the low/vertical mounted engine air intake located ahead of the radiator area on the long hood. Early phase 2 locomotives feature phase 1-style walkways/sills with stanchions mounted into the top walkway deck (referred to as "Phase 2a" models). Later phase 2 locomotives feature a revised configuration where the stanchions are mounted to the sides of the sill (referred to as "Phase 2b" models). Phase 2a production ran from December 1964 through September 1965. Phase 2b units were produced from December 1965 through the end of C420 locomotive production in August 1968.

The Atlas Master™ Series Gold versions of these locomotives are able to use all of the QSI® Quantum System™ sound features on DC layouts with use of the Atlas Quantum Engineer™. For more information on this product, click here or visit our online store for ordering info.